BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car



BMW E30
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
- 7. Exhaust system
   + 7.1.2. Exhaust system of cars 318i
   - 7.2. System of decrease in toxicity of exhaust gases
      7.2.2. Self-diagnostics of system of injection of Motronic
      7.2.3. Processor block (ECU block)
      7.2.4. Sensors of system of automatic control of the engine
      7.2.5. System of compulsory ventilation of a case (PCV system)
      7.2.6. System of catching of vapors of gasoline (EVAP system)
      7.2.7. Catalytic converter
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips



7.2.5. System of compulsory ventilation of a case (PCV system)

GENERAL INFORMATION

The system of compulsory ventilation of a case is intended for decrease in content of hydrocarbons in emissions of the engine because of a suction of gases from an engine case. Intra crankcase gases go for reburning in engine cylinders.

Device of system of compulsory ventilation of a case (M20)

System of the closed type. Intra crankcase gases go directly to the air filter under the influence of pressure in the engine. Gases with fresh air do not mix up. In a branch pipe for an exit of gases the flame arrester is established.

Hose of ventilation of a case

Gases come out a cover of a head of cylinders through a hose.

The filter is not provided in system of ventilation of a case therefore periodically clean channels of an exit of gases from dirt and a deposit.